SOLID MATERIALThe garden auger bits are made of high quality manganese steel and the shank is made of A3 steel, which is durable and not easy to deform. Finished with a glossy black lacquer finish that protects the bit well of the garden rust High EfficiencySpiral design ensures efficient digging and trouble-free soil dumping. Use the bit at a low (slow) speed and drill into the ground or suitable landscape, the auger easily digs a hole in just a few seconds and works well even on somewhat hard ground. Note: Not suitable for large or hard rocks Size: 4*45cm Wide ApplicationThese auger bits are ideal for professional gardeners, ideal for growing bulbs, potted plants, vegetables, flowers, bare root trees and shrubs, cultivated fields and mixed seeds. Keep always have the drill clean after use for optimal use every time